
Ok so. Kim Dan is so done with everything, he feels like he lost everything at this point. Remember, he was initially dragged into this sex thing with no initial feelings or even desire to do so, he did it out of despair. Kim Dan hated it at first, wanted to throw up when he was forced to give JK a blowjob, always connected the act of sex with a man to the sexual harassment he dealt with at work. So eventually, at this point, and knowing JK very well (means knowing that he's never gonna apologize or do anything decent, also realizing that there was no feelings involved at all like the ones Heesung assumed,) he's now just in another position of having to use his body to get rid of an unpleasant situation, that's how he dealt with this since the beginning. He's not caring if this is abuse or what, he's not seeing it as his time to shine in a chasing arc, Kim Dan doesn't think so highly of himself, he did some changes, but he's not covering all the reasons why he pulled aways from JK. The reason why he left Seoul was not to act hard to get, but only because he felt like he did a mistake at work and was not a good member to the team anymore. He was done with amount of blame he was taking from JK like never trusted him since the beginning, he saw his effort vanishing because of one mistake, that's what disappointed and hurted him the most, so he just wanted to fucking leave and take care with his grandma. So all this happening now is not gonna take the same thinking pattern in the head of Kim Dan as we do from our outer perspective, as people who know his value and who know that JK is developing attachement towards him. To him, it's just another scenario repeating itself, and if that can make him get rid of JK, then let's do this and finish it all already.
At least that's what I think.